From owner-freebsd-hardware  Thu Jul 10 06:09:01 1997
Return-Path: <owner-hardware>
Received: (from root@localhost)
          by hub.freebsd.org (8.8.5/8.8.5) id GAA01159
          for hardware-outgoing; Thu, 10 Jul 1997 06:09:01 -0700 (PDT)
Received: from critter.dk.tfs.com ([140.145.230.252])
          by hub.freebsd.org (8.8.5/8.8.5) with ESMTP id GAA01137;
          Thu, 10 Jul 1997 06:08:53 -0700 (PDT)
Received: from critter.dk.tfs.com (localhost [127.0.0.1])
	by critter.dk.tfs.com (8.8.6/8.8.5) with ESMTP id PAA00546;
	Thu, 10 Jul 1997 15:06:38 +0200 (CEST)
To: Bruce Evans <bde@zeta.org.au>
cc: danny@panda.hilink.com.au, phk@dk.tfs.com, freebsd-hardware@freebsd.org,
        freebsd-isp@freebsd.org, sdudley@byterunner.com
From: Poul-Henning Kamp <phk@dk.tfs.com>
Subject: Re: Configuring Byterunner TC-800 high speed 8-port serial card 
In-reply-to: Your message of "Thu, 10 Jul 1997 22:44:01 +1000."
             <199707101244.WAA05329@godzilla.zeta.org.au> 
Date: Thu, 10 Jul 1997 15:06:38 +0200
Message-ID: <544.868539998@critter.dk.tfs.com>
Sender: owner-hardware@freebsd.org
X-Loop: FreeBSD.org
Precedence: bulk

In message <199707101244.WAA05329@godzilla.zeta.org.au>, Bruce Evans writes:
>>>options COM_MULTIPORT
>>>device sio4 at isa? port 0x100 tty flags 0xb05
>>>...
>>>device sio11 at isa? port 0x138 tty flags 0xb05 irq 12 vector siointr
>>
>>You should set the 0x10000 flag (only in current yet) as well, to
>>avoid the case where a pending IRQ from a higher port prevents
>>sio's test#3 from passing on a lower port.
>
>No, you should keep the 0x10000 flag clear, so that a pending IRQ from
>a higher port causes sio's test#3 to fail on a lower port, since such
>IRQs "can't happen" (unless the multiport board is misconfigured or is
>actually a multi-infernal modem :-).

This is not true Bruce, they can happen if the sio driver doesnt disable
interrupt sources before you reboot your kernel.  The 0x10000 flag
is necessary if you want your sio ports after crashes.

--
Poul-Henning Kamp           | phk@FreeBSD.ORG       FreeBSD Core-team.
http://www.freebsd.org/~phk | phk@login.dknet.dk    Private mailbox.
whois: [PHK]                | phk@tfs.com           TRW Financial Systems, Inc.
Power and ignorance is a disgusting cocktail.